在Node.js Jade中需要幫助

Question

我想尋求有關在node.js Jade中顯示mySQL記錄的幫助。 我已經遵循了node.js Jade的基礎教程，並且能夠通過顯示默認的index.jade使其工作，但是當我開始在index.js中實現mySQL連接鏈接和功能時，它不顯示任何內容，並且在瀏覽器中未顯示任何數據。 希望你們能盡快幫助我，謝謝大家。

這是我的app.js：

var express = require('express');
var path = require('path');
var favicon = require('static-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var index = require('./routes/index');
var users = require('./routes/users');
var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.set('port', process.env.PORT || 3000);

app.use(favicon());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/users', users);

/// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

/// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});

module.exports = app;
var server = app.listen(app.get('port'), function() {
  console.log('Listening on port %d', server.address().port);
});

這是我的路線/ index.js：

var express = require('express');
var router = express.Router();
var mysql = require('mysql');

var conn = {
   host: 'localhost',
   user: 'user',
   password: 'password',
   database: 'rest_api',
   port: '3306'
};

/* GET home page. */
router.get('/', function(req, res) {
   exports.index = function(req, res) {
         var connection = mysql.createConnection(conn);
         var query ='SELECT sensorId, sensors, pinNo, sensorsType FROM sensorInfo';
         connection.query(query, function(err, rows, fields) {
                   if(err) throw err;
                res.render('index', { title: 'Sensor REST API', 'items': rows });    
         });
   };
});

module.exports = router;

這是我的/views/index.jade：

extends layout

block content
    h1= title
    p Welcome to #{title}
    table
        tr
            th Sensor ID
            th Sensors
       th Pin Number
       th Sensors Type
        -each item in items
            tr
                td=item.sensorid
                td=item.sensors
      td=item.pinNo
      td=item.sensorsType

這是我的sensorInfo結構：

CREATE TABLE IF NOT EXISTS `sensorInfo` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `sensorId` int(11) NOT NULL,
  `sensors` text COLLATE utf8_unicode_ci NOT NULL,
  `pinNo` int(11) NOT NULL,
  `sensorsType` text COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=4 ;

這是我想從sensorInfo中顯示出來的記錄：

--
-- Dumping data for table `sensorInfo`
--

INSERT INTO `sensorInfo` (`id`, `sensorId`, `sensors`, `pinNo`, `sensorsType`) VALUES
(1, 1, 'Red LED', 7, 'Switch ON/OFF'),
(2, 2, 'Blue LED', 11, 'Switch ON/OFF'),
(3, 3, 'Green LED', 13, 'Switch ON/OFF');

Answer 1

從路由器功能中刪除導出調用-從

exports.index = function(req, res) {
    var connection = mysql.createConnection(conn);
    var query ='SELECT sensorId, sensors, pinNo, sensorsType FROM sensorInfo';
    connection.query(query, function(err, rows, fields) {
              if(err) throw err;
           res.render('index', { title: 'Sensor REST API', 'items': rows });    
    });
};

至

var connection = mysql.createConnection(conn);
var query ='SELECT sensorId, sensors, pinNo, sensorsType FROM sensorInfo';
connection.query(query, function(err, rows, fields) {
    if (err) throw err;
    res.render('index', { title: 'Sensor REST API', 'items': rows });    
});